JEE Main levelSingle correct optionDifficulty 2 of 3mt072
Sulphide ores are generally roasted to oxides before reduction with carbon mainly because
Athe sulphide is more volatile than the oxide
Bcarbon reacts only with sulphur dioxide
Creduction of the oxide by carbon is thermodynamically feasible whereas direct reduction of the sulphide is not
Droasting makes the ore magnetic
Answer: C
The Gibbs energy of formation of CSX2 is positive and most metal sulphides are not stable enough for carbon to reduce them. So the sulphide is converted to the oxide, which carbon can reduce at a suitable temperature.